readproductdatatype.m

基于串行接口的GPS驱动程序

function data = ReadProductDataType(gps)
% ReadProductDataType Read product id, version number and descriptive text

    global pid_ack_byte;
    
    data = {};
    
    [id, sz] = ReadPacketHeader(gps);
    
    data{1} = fread(gps, 1, 'int16');
    data{2} = fread(gps, 1, 'int16');
    
    sz = sz - 4;
    
    term = get(gps, 'Terminator');
    set(gps, 'Terminator', 0);
    
    count = 0;
    while (sz > 0)
        index = count+3;
        data{index} = fgets(gps);
        sz = sz - length(data{index}) - 1; % Count the NULL
        count = count + 1;
    end
    set(gps, 'Terminator', term);
    
    cksum = ReadPacketTerminator(gps);
    
    WritePacket(gps, pid_ack_byte, id);